Chimney top and ventilator



(No Model.)

G. BURKHARDT.

CHIMNEY TOP AND VENTILATOR.

No. 317,718. Patented May 12, 1885.

ATTORNEYS UNIT D STATES.

PATENT OFFICE.

GUSTAV BURKHARDT, OF HOMER, ILLINOIS.

CHIMNEY TOP AND VENTlLATOFt.

SPECIFICATION forming part of Letters Patent No. 317,718, dated May 12,1885.

Application filed July 24, 1884. (No model.)

in thecounty of Champaign and State of Illi-- nois, have invented newand useful Improvements in Chimney Tops and Ventilators, of which thefollowing is a specification.

This invention relates to improvements in that class of ventilators andchimney-tops in which is employed a helical draft-channel; and theobjects of my invention are to provide novel means for supporting thehelix, whereby an upward draft is created in the latter by the wind orair currents, and to provide novel means for deflecting the smoke in anoutward direction above the helix.

The objects of my invention I accomplish in the manner and by theconstruction and com bination of devices hereinafter described andclaimed, reference being made to the accompanyin g drawings,illustrating my invention, in which Figure l is a vertical cross-sectionof the en ire device as adapted for use as a chimneytop. Fig. 2 is anelevation of the same.

Similar letters indicate corresponding parts.

The letter A designates the base of the device which base A is fastenedto the top of a chimney or other suitable place.

B is a conical smoke-pipe attached to the base A in the usual manner.

I is a helical draft-channel formed by a fiat strip, E, which isinclined to the axis of the chimney in the direction of its breadth,being wound helically, as shown.

G is a double conical crown secured to the upper end of the smoke-pipeB,.and to the upper conical side of which the strip E, forming thechannel I, is secured.

d d are strips serving as ties for thehelical draft-pipe, and also tosupport the cover F, which serves to keep out the rain. To the underside of the cover F is secured an inverted cone, J, for increasing theefficiency of the smoke-stack by deflecting the smoke in an outwarddirection directly above the helix formed by the strip E.

H H are braces supporting the smokepipe B.

The object of this helical channel I is to cause the air to pass alongits windings producing an effect in draft equal to a chimney ofconsiderable more height-that is to say, it increases the virtual heightof the chimney.

The object of the double conical crown (J at the upper end of thesmoke-pipe is twofold: its upper conical side serves to support thehelix, and the wind or air current, striking such side, causes an upwarddraft in the helical channel, and thereby renders the ventilator veryefficient in operation.

I do not broadly claim aventilator composed of a helical channel at theupper end of a pipe and provided with a conical cover; but

What I claim as new, and desire to secure by Letters Patent, is

1. The combination of the smoke-pipe, the double conical crown securedto the upper end thereof, and the helical channel supported by the upperconical side of the crown, said upper conical side of the crown alsoserving to create an upward draft in the helical channel, substantiallyas described.

2. The combination of the pipe B, the helical draft-channel I at theupper end thereof, the inverted cone J above the channel, and the coverF over the cone, substantially as described.

3. The combination of the pipe B, the double conical crown O, secured tothe upper end thereof, the helical channel I, supported by the upperconical side of the crown, and the inverted cone J, supported above thehelical channel, substantially as described.

4.. The combination of the pipe B, the double conical crown O, securedto the upper end thereof, the helical channel I, supported by the upperconical side of the crown, the rods d, aeting as ties to the helicalchannel, the cover F, supported above the helical channel by thetierods, and the inverted'cone J under the cover, substantially asdescribed. I t In testimony whereof I have hereunto set my hand and sealin the presence of two'sub Witnesses:

J. H. WAPLES, F. W. STONEBURNER.

